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APM Professional Telescopes

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

Astronomy is our job

Observatory Telescopes

Big prime focus telescopes for private or public observatories including installation and full service.

Robotic / Remote

Robotic instruments for automatic imaging or telescopes for remote observation.

ZWO ASI120MM Guider

asi120mm mini camera autoguider 1000

The new ZWO ASI120MM Mini (mono) with its 3.75 µm pixels is a highly sensitive  autoguider for in a 1.25" body

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Product enquiries

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Please make your enquiries about the products you require here. We will contact you as soon as possible with a customised quote.

ZWO Cameras

asi533

Suitable for the spectrograph
ZWO MONO Astro Camera ASI 533MM-PRO cooled, Sensor D= 16 mm, 3.76 µm Pixel Size
Cooled USB 3.0 monochrome astro camera with powerful back-illuminated CMOS sensor for astrophotography in square format

 Cameras for Spectroscope UVEX & LISA (VIS)

Lhires III Spectroscope

lh3 3The Lhires III spectroscope is the king of High Resolution (R = 18,000). Shelyak’s historic instrument was designed to observe details in one (or more) spectral lines. It’s the ideal tool for working with the Doppler effect and observing star activity.

An instrument of reference

The Lhires III spectroscope is Shelyak Instruments’ “historic” instrument. Designed from the CNRS Astrophysics School in 2003 for the observation of Be stars, it has since found a wide range of applications.

Resolution & spectral range

With a resolving power of R=18,000, it provides access to Doppler velocity measurements, as well as incredible detail in the profile of a line. The network module supplied as standard has 2400 lines/mm, giving full resolution. It can be replaced by an optional module, to access other resolutions – making the Lhires III a versatile instrument. You can adapt your resolution to your project. Weaker objects are then accessible: Novae, bright comets…

 

The spectral range covered is limited (of the order of ten nanometers, due to the need for high resolution), but you can select any wavelength in the visible range (400-750nm), thanks to a micrometer.

 

gt1

Grating module for the Lhires III

The Lhires III was specially designed for High Resolution, but these complementary network modules enable the instrument’s resolution to be changed, thus extending its fields of application. Plus le nombre de traits par mm est élevé, plus la résolution est haute.
Note: the Lhires III is supplied as standard with a 2400 t/mm network.

  • Grating 1800l/mm
  • Grating 1200 l/mm
  • Grating 600 l/mm
  • Grating 300 l/mm
  • Grating 150 l/mm

 

Numerous educational projects based on the Doppler effect are now possible, such as the rotation of Jupiter or Saturn.

bsp lh3

 

Aperture

The F/10 aperture makes it particularly well suited to Schmidt-Cassegrain telescopes. But it can also be mounted on other, more open instruments (by adding a Barlow lens).

Guiding system

Thanks to its mirror slit, the Lhires III enables the target star to be precisely positioned and held in the slit. A guiding camera (not supplied) enables the telescope’s movements to be controlled (autoguiding), ensuring optimum observation.

bsp2 lh3

Interchangeable slit

The interchangeable slit supplied as standard (15-19-23-35µm) means that the instrument can be adapted to most observations, giving priority to resolution or brightness if required. Other slits are also available as options (wide slits, photometric slits), to further extend the possibilities.

lh3 slit

Mechanical interfaces

The Lhires III is supplied with a standard interface for Schmidt-Cassegrain telescopes. If you wish to adapt it to a 2″ eyepiece holder, use the optional 2″ adapter.

 bsp lh4

The CCD adaptor supplied as standard is suitable for ATIK cameras. (13mm mechanical backfocus). We offer a wide choice of adapter rings in our accessories catalog.

The guiding camera is C-mount.

Going further with Lhires III

In addition to the astrophysical knowledge it can provide, the Lhires III is also a tool for collaboration between amateur and professional astronomers: studying Be-type stars, tracking variable stars, etc. Numerous scientific papers have been based on observations with a Lhires III.

Be 02 zetTau

RRLyr HAlpha

 

 

The support of a large community

The Lhires III is widely used around the world, and you can find many examples of use and advice on the Spectro-L discussion list: https://groups.io/g/spectro-l or on the spectroscopy forum: ARAS.

Specifications

  • Resolution power R ~18000 (with 23 µm slit)
  • Dispersion of 0.012nm (9µm pixels, around Hα)
  • Aperture F/10
  • Littrow architecture (the same achromatic doublet serves as collimator and lens)
  • Adaptor rings for different types of detectors: CCD cameras, Digital Cameras, etc.
  • Mirror slit for precise guiding (4 positions 15/19/23/35 µm).
  • Slit length 8 mm
  • Wavelength selected per micrometre throughout the visible range (400-700 nm)
  • Included wavelength calibration lamp (argon/neon)
  • Included tungsten lamp for flats
  • Motorised calibration lamps for remote use
  • Schmidt-Cassegrain adaptor (2″) as standard, mechanical backfocus 68.5 mm,
  • Dual-lens C-mount guide port (focal ratio: 0.8x), mechanical backfocus 17.5 mm guide camera
  • T-mount acquisition port, mechanical backfocus 55 mm (APN compatible)
  • Interchangeable grating module (2400 tt/mm as standard)
  • Light: 1.7 kg
  • Compact: 250 mm x 200 mm x 83 mm
  • Supplied in a hard case, with an eyepiece holder and a set of tools.

Composition

  • The Lhires III spectroscope
  • The interchangeable slit (15-19-23-35µm)
  • Schmidt-Cassegrain telescope interface
  • CCD adapter (for camera with 13mm back focus)
  • Eyepiece holder (for observing the Sun’s spectrum by eye; eyepiece not supplied)

Documents

Applications

Articles related to the Lhires III spectroscope:

bsprs ophbsp dsspox

Additional modules: technical specifications

Description Shelyak ref. Acc. type Included Comment
Integrated guiding module   Guiding module  
Integrated calibration module   Calibration module  
SPOX with 0.8m cable ES0013 Other add-on modules   For remote control of flat and calibration lamps. Short cable for telescope installation.
SPOX with 5m cable ES0012 Other add-on modules   For remote control of flat and calibration lamps. Câble long pour une utilisation à côté du télescope.

 

 

 

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

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